An unexpected four-component (3+1) reaction of an alkyl isocyanide with alkylidene-substituted Meldrum’s acid in CH2Cl2 at room temperature produces imino-furopyranones in good yields. The structures of the products are deduced from their IR, 1H NMR, and 13C NMR spectra and by X-ray analysis. The products are structurally similar to 2H-furo[2,3-c]pyran-2-one natural products.
室温下,烷基异氰化物与亚烷基取代的麦德鲁姆酸在CH 2 Cl 2中发生意外的四组分(3 + 1)反应,可生成高收率的亚氨基呋喃基吡喃酮。由它们的IR,1 H NMR和13 C NMR光谱以及通过X射线分析推导产物的结构。该产物在结构上类似于2 H-呋喃[2,3 - c ]吡喃-2-酮天然产物。
A new and convenient method for synthesis of barbituric acid derivatives
作者:A. Habibi、Z. Tarameshloo
DOI:10.1007/bf03246226
日期:2011.3
In continuation of our current studies on the reaction between isocyanides and electron-defficient alkenes, we would like to report our recent reseaarch on synthesizing novel derivatives of barbituric acid. The reaction of alkylidene-substituted Meldrum’s acid with alkyl isocyanides in the presence of urea led to the production of the corresponding 2-(hexahydro-2,4,6-trioxopyrimidin- 5-yl)-N,2-dimethylpropanamide
One-pot synthesis of new dye derivatives of succinimide via three-component reaction of alkylidene Meldrum's acid, isocyanides and p-aminoazobenzene derivatives
One-pot reaction of alkylidene Meldrum'sacid with alkyl isocyanides in the presence of 4-(2-phenyldiazenyl)benzenamine derivative leads to the corresponding azo 2,5-dioxo-3-pyrrolidine carboxamide in good yields.
at the 4-position was studied. The five-step sequence includes construction of benzocyclopentanone oxime by Knoevenagel condensation of cyclic ketones with Meldrum’s acid followed by Michael addition of aryl Grignard Reagent, intramolecular Friedel–Crafts acylation, condensation with hydroxylamine, and reductive ring expansion reaction using diisobutylaluminium hydride. The utility of this method was